Barnstead Thermolyne Corporation

Kenneth David Hermsen

James R Edwards

Mark D Lockwood

Kerry W Leppert

Eric Garz

Roger W Earle

John L Meek

Curt McFadden

Eric Jackson

Michael S Duvinski

A stirring hot plate for simultaneously heating and stirring a mixture includes a phase controlled motor that spins magnets which couple to, and thereby spin, a stir bar within the mixture. In addition to spinning the magnets, the motor includes an operational mode in which the motor is rapidly braked thereby quickly spinning down the stir bar. The stirring hot plate also includes a visual indicator to the user that the platform is hot-to-the-touch that is especially effective when the stirring hot plate is not in use.

Stirring hot plate

An orbiting platform mixer having a reversing cycle of operation. In response to input signals defining set points for the platform velocity, the mixing cycle time and the reversing period, a control commands a reversing cycle of a rotation of the orbiting platform in one direction at the at the platform velocity for the rotation period. After a pause, the control commands a rotation of the orbiting platform in the opposite direction for the rotation period; and the above reversing cycle is repeated for a period of time equal to the mixing cycle time. The control permits the input signals to be changed at an accelerated rate in response to the continued single state, that is, pressed state, of a push-button.

Reversing orbital platform mixer

Growing community of inventors

Dubuque, IA, United States of America

Kenneth David Hermsen